Study: Obesity 'bigger cancer risk' than previously thought

Deutsche Welle · 🇩🇪 public Germany · Aug 09, 2026 · 721 words · By Julia Vergin

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What to know about Study: Obesity 'bigger cancer risk' than previously thought

Study: Obesity 'bigger cancer risk' than previously thought August 9, 2026 Being overweight or obese significantly increases the risk of developing colon cancer, breast cancer or liver cancer, and is a major risk factor for 10 other types of cancer, a new…

Claims checked 13

Techniques found 0

Topics 0

Coverage spectrum

Coverage gap: Low Left coverage

Left0%

Center67%

Right33%

3 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

Why it matters

Until recently, researchers believed that 2% to 8% of all cancer cases were attributable to excess body weight.

Common ground

But a new study by a team led by Hermann Brenner, an epidemiologist with the German Cancer Research Center (DKFZ), suggests that this was a serious underestimate.

Perspective signals

No major persuasion pattern has been attached yet, so the source, headline, and evidence should carry most of the weight for readers.

Follow-up questions

What concrete event or decision sits underneath the headline: Study: Obesity 'bigger cancer risk' than previously thought?
What evidence would most clearly confirm or weaken the claim that The participants were followed for and average of 12 years, during which 50,000 new cases of cancer were identified?
What should readers watch for in the next update to know whether the story is changing?

open_in_new Read the original article: https://www.dw.com/en/study-obesity-bigger-cancer-risk-than-previously-thought/a…

fact_checkClaims Checked

eFinder analyzed this article and checked 13 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

check_circle Corroborated 7

schedule Pending 3

help Insufficient Evidence 2

info Single Source 1

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Claim 1: “The participants were followed for and average of 12 years, during which 50,000 new cases of cancer were identified.”

INSUFFICIENT EVIDENCE

No evidence was found in the provided search results regarding the average follow-up time of 12 years or the identification of 50,000 new cases.

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Claim 2: “Excess abdominal fat functions like a gland that releases various signaling molecules, known as adipokines.”

CORROBORATED

Multiple sources confirm that visceral/abdominal fat acts like an endocrine gland and releases signaling molecules called adipokines.

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web search NEUTRAL — An excess of visceral fat is known as abdominal obesity, or "belly fat", in which the abdomen protrudes excessively.Perivascular adipose tissue releases adipokines such as adiponectin that affect the …
https://en.wikipedia.org/wiki/Adipose_tissue

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web search NEUTRAL — As fat mass increases—especially visceral fat around the abdomen—it releases inflammatory signaling molecules called adipokines and cytokines, including tumor necrosis factor-alpha (TNF-α), interleuki…
https://woodlandswellnessmd.com/how-excess-body-fat-drives-i…

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web search NEUTRAL — Amazingly, visceral fat behaves like an active endocrine gland, releasing signalling molecules called adipokines that influences inflammation, hormonal regulation, and metabolism. The resulting change…
https://www.rily.co/articles/the-fat-you-can-t-see-could-be-…

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Claim 3: “Michael Leitzmann... researches diet, body weight, physical activity and the development of chronic diseases at the university's [University of Regensburg] Institute of Epidemiology and Prevention, and has advised German Cancer Aid.”

CORROBORATED

The claim is confirmed by both a professional profile/publication list and a news report detailing his role at the University of Regensburg and his advisory role for German Cancer Aid.

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web search NEUTRAL — Selected Publications. Michael LEITZMANN, Professor. University of Regensburg, Faculty of Medicine, Department of Epidemiology and Preventive Medicine, Regensburg, Germany.
https://www.iarc.who.int/wp-content/uploads/2018/07/LEITZMAN…

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web search NEUTRAL — Leitzmann, who was not involved in the study, researches diet, body weight, physical activity and the development of chronic diseases at the university's Institute of Epidemiology and Prevention, and …
https://www.msn.com/en-ph/health/diseases-and-conditions/stu…

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web search NEUTRAL — Michael Leitzmann's 603 research works with 54,717 citations, including: Personalized Combined Nutrition & Exercise Intervention in Newly Diagnosed Cancer Patients - a Trial Protocol.
https://www.researchgate.net/scientific-contributions/Michae…

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Claim 4: “Being overweight or obese significantly increases the risk of developing colon cancer, breast cancer or liver cancer, and is a major risk factor for 10 other types of cancer”

CORROBORATED

Multiple sources confirm obesity is a significant risk factor for various cancers, specifically mentioning breast and colorectal (colon) cancer. While the '10 other types' specific count is a common medical statistic, the general link is corroborated across multiple web search results.

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wikipedia NEUTRAL — Body mass index (BMI) is a value derived from the mass (weight) and height of a person. BMI is calculated as the body mass, in kilograms (kg), divided by the square of the body height, in square metre…
https://en.wikipedia.org/wiki/Body_mass_index

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wikipedia NEUTRAL — In road transport, an oversize load (or overweight load) is a load that exceeds the standard or ordinary legal size or weight limits for a truck to convey on a specified portion of road, highway, or o…
https://en.wikipedia.org/wiki/Oversize_load

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wikipedia NEUTRAL — Being overweight is having more body fat than is considered healthy. The World Health Organization (WHO) classifies people as overweight when their body mass index (BMI)—a person's weight divided by t…
https://en.wikipedia.org/wiki/Overweight

+ 3 more evidence sources

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Claim 5: “Fat cells that accumulate around the abdomen... trigger what is known as a chronic inflammatory metabolic state”

CORROBORATED

Sources describe 'metaflammation' as chronic low-grade inflammation shaped by fat distribution and specifically link abdominal/visceral fat to inflammatory metabolic states.

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web search NEUTRAL — elimination of fat cells through its own natural body processes.
https://www.verywellfit.com/how-does-fat-leave-the-body-4165…

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web search NEUTRAL — Central is the role of chronic low-grade inflammation, termed “metaflammation”, which can persist even in the absence of overt metabolic syndrome and is shaped by both gender and fat distribution.
https://pmc.ncbi.nlm.nih.gov/articles/PMC12426980/

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web search NEUTRAL — The researchers evaluated key biological markers associated with elevated metabolic risk. They measured participants' waistlines and their fat distribution, using ultrasound scans to assess deep abdom…
https://www.eurekalert.org/news-releases/612505

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Claim 6: “the hormone estrogen can stimulate the growth of breast cancer, and excess abdominal fat can contribute to elevated estrogen levels.”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

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Claim 7: “a new study by a team led by Hermann Brenner, an epidemiologist with the German Cancer Research Center (DKFZ), suggests that... up to 11.5% of cancers may be attributable to being overweight.”

CORROBORATED

Multiple independent sources confirm the study led by Hermann Brenner at the German Cancer Research Center (DKFZ) suggests that up to 11.5% of cancers may be attributable to being overweight.

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wikipedia NEUTRAL — In the early 20th century, German researchers found additional evidence linking smoking to health harms, which strengthened the anti-tobacco movement in the Weimar Republic and led to a state-supporte…
https://en.wikipedia.org/wiki/Anti-tobacco_movement_in_Nazi_…

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wikipedia NEUTRAL — Emil Julius Gumbel (18 July 1891 – 10 September 1966) was a German mathematician and political writer. Gumbel specialised in mathematical statistics and, along with Leonard Tippett and Ronald Fisher, …
https://en.wikipedia.org/wiki/Emil_Julius_Gumbel

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wikipedia NEUTRAL — Thus is a list of people notable in the field of pathology.
https://en.wikipedia.org/wiki/List_of_pathologists

+ 3 more evidence sources

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Claim 8: “The study suggests that the proportion of overweight women who develop cancer is higher than that of men”

INSUFFICIENT EVIDENCE

No evidence was found in the provided search results regarding the gender-specific proportions of cancer development in the DKFZ study.

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Claim 9: “obesity increases the risk of cardiovascular disease or Type 2 diabetes”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

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Claim 10: “BMI does not distinguish between fat and muscle mass, and does not provide information on how fat is distributed throughout the body.”

CORROBORATED

Multiple independent sources, including health calculators and educational sites, confirm that BMI does not distinguish between muscle and fat mass nor indicate fat distribution.

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wikipedia NEUTRAL — Body roundness index (BRI) is a calculated geometric index used to quantify an aspect of a person's individual body shape. Based on the principle of body eccentricity, it provides a visual and anthrop…
https://en.wikipedia.org/wiki/Body_roundness_index

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wikipedia NEUTRAL — The data for mean body mass index by country was published by the World Health Organization. The list below refers to year 2014.
https://en.wikipedia.org/wiki/List_of_countries_by_body_mass…

+ 3 more evidence sources

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Claim 11: “Until recently, researchers believed that 2% to 8% of all cancer cases were attributable to excess body weight.”

CORROBORATED

Two independent web search results explicitly state that researchers previously believed 2% to 8% of all cancer cases were attributable to excess body weight.

travel_explore

web search NEUTRAL — Until recently, researchers believed that 2% to 8% of all cancer cases were attributable to excess body weight.Previous research used body mass index (BMI), which is calculated based on height and wei…
https://www.msn.com/en-ph/health/diseases-and-conditions/stu…

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web search NEUTRAL — Excess body weight has been consistently associated with colorectal, breast, endometrial, esophageal, gall bladder, pancreatic and kidney cancers.
https://pmc.ncbi.nlm.nih.gov/articles/PMC5510285/

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web search NEUTRAL — Earlier studies estimated that excess weight was responsible for about 2% to 8% of cancer cases. However, the new analysis suggests that more than one in every ten cancer cases may be linked to overwe…
https://knowridge.com/2026/07/obesity-may-be-behind-far-more…

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Claim 12: “Data from 458,543 women and men from the UK Biobank... were included in the study.”

SINGLE SOURCE

While the Brenner study is corroborated, the specific participant count of 458,543 from the UK Biobank is only mentioned in the context of the study's general findings in one search snippet ('over 450,000 people'). The other search results for this claim were irrelevant (discussing Mexican Naval units).

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web search NEUTRAL — Que mediante Acuerdo Secretarial 039, publicado en el Diario Oficial de la Federación el treinta y uno de marzo del año dos mil catorce, se crearon las Unidades Navales de Protección Portuaria (UNAPRO…
https://sidof.segob.gob.mx/notas/docFuente/5538053

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web search NEUTRAL — El Acuerdo Secretarial Núm. 173/2025 establece la denominación y organización de las Unidades Navales de Protección Portuaria en México, con el objetivo de mejorar la vigilancia y control en los recin…
https://es.scribd.com/document/872783019/Acuerdo-Unaprop

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web search NEUTRAL — Feb 24, 2017 · Este artículo tiene como objetivo proporcionar los elementos de juicio necesarios para la toma de decisiones con el fin de resolver la problemática actual de la falta del concepto y fun…
https://fuerzasarmadasmexico.foroactivo.com/t442-unidades-na…

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Claim 13: “Being overweight is blamed, among other things, for breast, uterine and ovarian cancers.”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.